Radiation device



H' P' WOOD RADIATION DEVICE Oct 87 Filed March 27, 1934 Patented Oct. 8, 1935 UNITED STATES PATENT OFFIE 2,016,474 RADIATION DEVICE Harold. P.

Wood, Newton, Mass., assigner to Inkset Products Inc., a corporation of Massachusetts In the use of devices for detecting counterfeit bills, raised checks and the like by short-wave radiation, such as ultraviolet rays, diiculty has been experienced on account of the breaking of the ray filters, due to the excessive heat developed by the source of radiation.

The object of the present invention is to provide a radiation device having ray filter wherein the heat developed by current of fresh air to flow across the iilter and preferably around the exterior of the hollow member which houses the source and supports said filter, thereby providing the device with a natural ventilation system and overcoming the diiculty aforesaid.

In the drawing which accompanies and forms a part of this specification,

Figure 1 is a vertical section of a radiation device embodying my invention; and

Fig. 2 is a fragmentary horizontal section taken on the line 2-2 of Fig. 1.

In this particular embodiment of my invention, I is a housing of any suitable material, herein shown as bell-shaped and flaring downwardly. Disposed within and spaced from said housing is a hollow member 2, said member being secured to said housing in any suitable manner. In the present instance the securing means are represented as a plurality of bolts 3 which pass through the bushings 4 to space the two members apart. The housing I is open at both ends and disposed within the same near the upper end 5 which in the present instance is shown as projecting through the aperture 6 in the upper end of the housing, the diameter of said holder being less than that of said aperture. The holder, the upper end of which preferably is ventilated at 1, 1, is secured to the housing by the bolts 8 which pass through the bushings 9 to maintain the separation of the holder from the housing,

Preferably the lamp socket holder is formed of aluminum, or other material having a high degree of heat conductivity. Within the holder is disposed a lamp socket I0 in which is inserted a source of short-Wave radiation, such as ultraviolet rays.

The hollow member 2 is provided with an aperture II at its upper end, said aperture being larger in diameter than the neck of the lamp to be inserted in the lamp socket.

Intermediate the ends of the member 2 are a plurality of circumferentially spaced openings I2, and an annular baffle I3 preferably upwardly flaring, is secured to the inner member immedithe source will cause a ately below said openings and terminates slight-- ly above the plane thereof.

A at ring I4 is secured in any suitable manner to the lower end of the inner member and supports the filter socket I5 in which is disposed the ray lter I6. The ray filter holder may be provided with more than one filter compartment for the reception of ray filters passing ultraviolet rays only and ultra violet rays with a variable amount of visible light, respectively, in ac- 10 cordance with the desired use of the radiation device.

Preferably the member 2 is constructed and arranged to act as a refiector for the rays radiated by the source.

The ring I4 is provided with aseri-es of circumferentially spaced openings I1 and an annular baiiie I8 inclined inwardly toward the lter and terminating above and spaced upwardly from the holder I5 is suitably secured to the ring Ill.

The heat developed by the source of radiation would soon destroy the filters were it not for the arrangements above itself automatically across the filter and around inner member 2. raises the temperature of both the outer and inner bell-shaped members and thus induces a flow of fresh -air upwardly through the passageway I9 and out through the opening 6, and such current is augmented by heat given off by the aluminum socket holder 5. The heated air within the vmember 2 is sucked by said air flow through the openings l2 and the aperture I I into said passageway I9, thereby reducing the temperature within the hollow member 2.

The elevation of the temperature within the member 2 induces a flow of fresh air thereinto by way of the openings I'I and this current is directed to the peripheral portion of the filter and deflected across the latter by the baie I8, thereby preventing the temperature of said filter from rising sufficiently to injure the same.

It will be noted that the baffles I2 and I8 are so constructed and arranged as to prevent the escape of light rays from the lamp chamber and still not impede the air movements above indicated.

It has been found in practice that with the arrangement above described it is feasible to employ a long-life, high-power lamp with the necessary ray filters without injury to the latter.

The provision of the inner member 2 with the openings I2 is not absolutely essential.

creates a flow of fresh air the exterior of the described whereby such heat The heat of the lamp speedily In vuse the radiation device may be secured to a stand 20 or suspended by the ring 2|.

Having thus described an illustrative embodiment of my invention, without however limiting the same thereto, what I claim and desire to secure by Letters Patent is:

l. A radiation device member near the upper end thereof, said outer bell-shaped member having an aperin diameter than that of said lamp in said socket, a closure for the bottom of said inner bell-shaped member, said closure being provided with an aperture, a ray filter holder secured to said closure and covering the aperture therein, the inner bell-shaped member being provided with a plurality of circumferentially-spaced openings intermediate the ends thereof and an annular upwardly ilaring baille secured to the outer wall of said inner bell-shaped member immediately below said openings and terminating above the plane thereof.

2. A radiation device comprising in combination a housing provided with an aperture at its upper end, a lamp socket disposed within said openings and terminating above the plane thereof.

3.11. radiation device comprising a hollow member constructed of circumferentially spaced openings and an inwardly inclined baffle secured to said annular 5. A radiation device comprising a hollow member, a source of radiation disposed therein, a fil- 20 ter disposed at the lower end of said hollow memradiation, said means comprising a baille eXtend- 25 being 50 spaced away from the periphery of said filter.

HAROLD P. WOOD. 

